jacobus



May 8, 1928..

D. S. JACOBUS HEAT TRANSFER DEVICE Filed March 2, 1927 Fiiim' Patented May 8, 1928.

UNITED STATES attests earner @FFEEQE.

DAVID S. ITAGOBUS, OF MONTCLAIR, NEW JERSEY, ASSIGNOR TO THE BABGOCK & WILCOX COMPANY, OF BAYONNE, NEIV JERSEY, A CORPORATION OF NEW JERSEY.

nnar-iraansrnn DEVICE.

Application filed March 2,

This invention relates to a heat transfer device by which heat is transferred from one fluid to another and is especially useful as an economizer in which heat from the waste products of combustion of a boiler furnace is used to heat incoming feed water for the boiler. The invention will be understood from the description in connection with the accompanying drawings, in which Fig. 1 is a vertical section through an illustrative embodiment of the invention and Fig. 2 is a horizontal section along the line 22 of Fi 1.

In the economizer illustrated in this embodiment of the invention, the water flows through the economizer in two paths from the bottom to the top. In the drawings reference characters 4 and 5 represent opposite walls of the flue for the waste products of combustion, across which the tubes of the economizer extend. The other walls of the flue or gas passage are shown at 6. An inlet drum or distributor '7 is located outside of the flue and two-rows of tubes 8 and 9 extend from this header 7 through the walls 4 and 5. The holes in the wall through which the tubes extend are of such a size that gas-tight joints are made, so that the main portions of the tubes can be washed to clean the same without danger of the water com ing into contact with headers outside of the flue.

The ends of the row of tubes 8 are connected by removable return bends 10 outside of the flue to the ends of a row of tubes 11 by means of unions 12, and the other ends of the row of tubes 11 are connected to a header 13 from which another row of tubes 8 extends across the flue and is connected by return bends 10 to a row 11', and so on back and forth across the flue to'the outlet header 14.

The ends of the row of tubes 9 are connected to a header 15 from which a row of tubes 16 extends through the flue and the ends thereof are connected by removable return bends 17 to a row of tubes 9, which extends across the flue to the header 15, and so on until the last row of this set of tubes likewise enters the outlet header 14:. In cases where the tubes are of considerable lengths, one or more supports 18 for each row of tubes may extend across the flue transversely to the tubes and support the 1927. Serial No. 172,050.

same to prevent them from bending or sagging.

It will thus be seen that the entering water first crosses the flue in rows of tubes that are near each other, part of the water crossing back through a row near one of the water between the economizer tubes is obviated. due to the fact that the water and any steam that may be generated in any tube passing across the economizer, passes into a. cross header and is thereby equalized or distributed among the tubes, and the distribution of water in the several tubes is made to remain substantially uniform or even. By the present invention, there are two paths of flow through the economizer which give twice the flow area, and at the same time reduces the distance that the water would have to flow from the inlet to the outlet header if only a single path were provided. Frictional resistance of the flow of water through the economizer isthus greatly reduced, and the amount, of power required for forcing the water through the economiz'cr is diminished.

Another advantage comes through the long radius of curvature of the return bends which provides flexibility and avoids undue strains due to expansion of the economizer tubes. By spanning two rows of tubes and connecting the rows above and below the two rows that are spanned, the radius of curvature of the return bends can be made much greater than where the return bends connect adjacent rows of tubes, as is ordinarily done in this type of a construction.

I claim:

1. In a heat transfer device, a flue, headers on opposite sides of said flue, sets of tubes extending across said flue, one of said sets of tubes being connected to the headers on one side and another set to the headers on the other side.

2. In a heat transfer device, afiue, headers on opposite sides of said flue, rows of adjacent tubes extending across said flue, one row being connected to a header 011 one side nd an adjacent row to a header on the o 1er side.

3. In a heat transfer device, a flue, headers on opposite sides of said flue each staggered with respect to headers on the other side, sets of tubes extending across said flue, one of said sets of tubes being connected to the headers on one side and another set to the headers on the other side.

4. In a heat transfer device, a flue, headers on opposite sides of said flue, sets of tubes extending across said flue, one of said sets of tubes being connected to the headers on one side and another set to the headers on the other side, tubes in each set being connected by return bends adjacent the headers to Which the tubes of the other set are connected.

5. In a heat transfer device, a flue, headers on opposite sides of said flue, sets of tubes extending across said flue, some of the tubes in each set being spaced apart suflicient distances to accommodate tubes of another set.

6. In a heat transfer device, a flue, headers on opposite sides of said flue, sets of tubes extending across said flue, the tubes in a set being located near a tube in its set on one side and spaced from another tube in its set on the other side a suflicient distance to accommodate tubes of another set.

7. In a heat transfer device, a flue, sets of tubes comprising rows close together and rows spaced considerable distances apart, the ends of said rows that are close together being connected by headers and the ends of saidrows that are spaced apart being connected by return bends.

8. In a heat transfer device, a flue, sets of tubes comprising rows close together and rows spaced Considerable distances apart, the ends of said rows that are close together being connected by headers and the ends of said rows that are spaced apart being connected by return bends, the headers and return bends for each set being located on opposite sides of said fine.

9. In a heat transfer device, a flue, sets of tubes comprising rows close together and rows spaced considerable distances apart, the ends of said rows that are close together being connected by headers and the ends of said rows that are spaced apart being con nected by return bends, the headers and return bends for each set being located on opposite sides of said flue, and the return bends for each set extending across the headers for another set.

10. In a heat transfer device, a flue, headers on opposite sides of said flue, sets of tubes extending across said flue, one of said sets of tubes being connected to the headers on one side and another set to the headers on the other side, said headers being located outside of said flue.

11. In a heat transfer device, a flue, headers on opposite sides of said flue, sets of tubes extending across said flue, one of said setsof tubes being connected to the headers on one side and another set to the headers on the other side, tubes in each set being connected by return bends adjacent the headers to which the tubes of the other set are connected, said headers and return bends being located outside of said flue.

12. In an economizer, means to provide sandwiched paths of flow of a fluid therethrough, said means comprising headers and return bends connecting rows of tubes.

13. In an economizer, means to provide sandwiched paths of flow of a fluid therethrough, said means comprising headers and return bends connecting rows of tubes, the headers and return bends for the same path being located on opposite sides of the gas passage.

14. In an economizer, means to provide sandwiched paths of flow of a fluid therethrouglnsaid means comprising headers and return bends connecting rows of tubes, the headers and return bends for the same path being located on opposite sides of the gas Jassage and staggered with respect to the headers and return bends of another path.

15. In an economizer, a horizontal inletheader and a horizontal outlet header, two horizontally extending roWs of tubes between said headers, and means for causing the distribution of water through said tubes to rcn'iain substantially uniform.

16. In an economizer, a horizontal inlet header and a horizontal outlet header, two horizontally extending rows of tubes between said headers, andmeans for causing the distribution of Water through said tubes to remain substantially uniform, said means comprising headers intermediate said inlet and outlet headers to which said tubes are connected.

17. In an economizer, a horizontal inlet header and a horizontal outlet header, two horizontally extending rows of tubes passing back and forth through said economizer be tween said headers, and means for causing the distribution of water through said tubes to remain substantially uniform.

' DAVID S. JACOBUS. 

